Pink or peach-coloured quartz is called rose quartz and is mainly used in decorative carvings. It's colour is thought to be due to the presence of small amounts of titanium. Crystals of rose quartz are very rare; more usually, massive lumps are found, which can be carved or cut en cabochon or as beads. Transparent material is uncommon; it is usually cloudy or cracked, partly because it is brittle. Rutile inclusions in rose quartz may produce a star effect when the stone is cut en cabochon.
Occurrence - Rose quartz is found in pegmatites. The best material is from Madagascar, but Brazil produces a greater quantity. Other sites are the USA (Colorado), the former USSR, Scotland and Spain.
Sources: Hall C (2002). Gemstones.United States. Smithsonian Handbooks